EP0447061A2 - Bildverstärker - Google Patents

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Publication number
EP0447061A2
EP0447061A2 EP91301568A EP91301568A EP0447061A2 EP 0447061 A2 EP0447061 A2 EP 0447061A2 EP 91301568 A EP91301568 A EP 91301568A EP 91301568 A EP91301568 A EP 91301568A EP 0447061 A2 EP0447061 A2 EP 0447061A2
Authority
EP
European Patent Office
Prior art keywords
power supply
image intensifier
image
enabled
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91301568A
Other languages
English (en)
French (fr)
Other versions
EP0447061A3 (en
Inventor
Kevin Anthony Derek Hadfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teledyne UK Ltd
Original Assignee
EEV Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EEV Ltd filed Critical EEV Ltd
Publication of EP0447061A2 publication Critical patent/EP0447061A2/de
Publication of EP0447061A3 publication Critical patent/EP0447061A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/98—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/64—Circuit arrangements for X-ray apparatus incorporating image intensifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2231/00—Cathode ray tubes or electron beam tubes
    • H01J2231/50—Imaging and conversion tubes
    • H01J2231/50057—Imaging and conversion tubes characterised by form of output stage
    • H01J2231/50063—Optical
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2231/00—Cathode ray tubes or electron beam tubes
    • H01J2231/50—Imaging and conversion tubes
    • H01J2231/50057—Imaging and conversion tubes characterised by form of output stage
    • H01J2231/50089—Having optical stage before electrical conversion
    • H01J2231/50094—Charge coupled device [CCD]

Definitions

  • This invention relates to image intensifiers, in particular image intensifiers utilising a high operating voltage but which are energised from a low voltage power source by means of dc to dc converters.
  • an image intensifier apparatus utilising a high operating voltage, includes a power supply for producing the voltage operable in an intermittent manner such that the power supply is enabled for a period which is much less than the period for which it is inhibited.
  • the eye if the eye is viewing the phosphor directly, then it will be looking at the less sharp image for the 5% of the time that the converter is operating, but for 95% of the time it will be looking at the sharper image obtained when the converter is not operating.
  • the combination of phosphor persistence and visual persistence will result in the perception of a picture which is the weighted average of the sharper and less sharp images. Because the weighting is strongly biased towards the sharper image the eye will see a picture which is very nearly as good as if the intensifier was not influenced by the magnetic field from the converter.
  • the converter may be enabled for slightly longer than the field blanking period t2.
  • the first few lines preceding and/or following the field blanking period will be susceptible to interference from the converter oscillator. However, this may not be objectionable, especially if the camera is used in conjunction with an overscanned monitor when the affected lines will not be visible to the viewer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Studio Devices (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP19910301568 1990-03-10 1991-02-26 Image intensifiers Withdrawn EP0447061A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909005444A GB9005444D0 (en) 1990-03-10 1990-03-10 Image intensifiers
GB9005444 1990-03-10

Publications (2)

Publication Number Publication Date
EP0447061A2 true EP0447061A2 (de) 1991-09-18
EP0447061A3 EP0447061A3 (en) 1992-01-29

Family

ID=10672415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910301568 Withdrawn EP0447061A3 (en) 1990-03-10 1991-02-26 Image intensifiers

Country Status (3)

Country Link
US (1) US5179445A (de)
EP (1) EP0447061A3 (de)
GB (2) GB9005444D0 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2696843B1 (fr) * 1992-10-14 1994-12-09 Matra Sep Imagerie Inf Appareil de prise de vues à distance, à haute résolution, pour porteur aérien.
US5555021A (en) * 1993-12-14 1996-09-10 Watec America Corporation Compact television camera with switching noise prevention
US6172708B1 (en) * 1997-02-18 2001-01-09 Itt Manufacturing Enterprises, Inc. Modular night vision device and power supply for a television camera
US20050259179A1 (en) * 2004-05-24 2005-11-24 Jerry Lynn Robertson Electro-optical shutter

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3553363A (en) * 1968-12-30 1971-01-05 Westinghouse Electric Corp Power supply for camera system including image intensifier
US3864595A (en) * 1973-04-19 1975-02-04 Westinghouse Electric Corp Automatic brightness control for gated micro-channel plate intensifier
FR2287136A1 (fr) * 1974-10-01 1976-04-30 Thomson Csf Dispositif de prise de vue de television a bas niveau de lumiere et systeme comportant un tel dispositif
FR2350684A1 (fr) * 1976-05-06 1977-12-02 Labo Electronique Physique Tube a vide convertisseur d'images infrarouges et procede de mise en oeuvre dudit tube
US4872057A (en) * 1986-11-21 1989-10-03 Sperry Marine Inc. Pulse modulated automatic light control utilizing gated image intensifier
US4771333A (en) * 1987-06-15 1988-09-13 Xerox Corporation System for minimizing residual charge carryover in an asynchronous raster input scanner
US4839569A (en) * 1987-12-08 1989-06-13 Varo, Inc. Method and apparatus for providing gain control for an image intensifier tube
US4882481A (en) * 1988-10-19 1989-11-21 Sperry Marine Inc. Automatic brightness control for image intensifiers
US4935817A (en) * 1988-12-22 1990-06-19 Sperry Marine Inc. Dual mode all - light level television camera
KR970003032B1 (ko) * 1989-10-17 1997-03-13 상요 덴기 가부시끼가이샤 고체 촬상 장치

Also Published As

Publication number Publication date
US5179445A (en) 1993-01-12
GB2241856A (en) 1991-09-11
GB9103949D0 (en) 1991-04-10
GB2241856B (en) 1994-05-18
EP0447061A3 (en) 1992-01-29
GB9005444D0 (en) 1990-05-09

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